Using popular IC 555 we can make Electronic Horn Circuit for cycle, alarm or fun use. This Electronic Horn Circuit using IC 555 and one 8Ω speaker makes loud horn sound for car or alarm. One 555 work as astable multivibrator which means it make square wave by switching high and low voltage again and […]
AC Power Outlet with Timer Circuit
In this AC Power Outlet with Timer Circuit think about a normal plug goes in wall but this one have a timer built-in like small control panel. This is called a timer plug or outlet timer. We can plug other device into it. Inside, small chip work like a brain and it is called 555 […]
Tachometer Circuit
This easy to build Tachometer Circuit is a small DIY tool to check speed of rotating shaft or disc. We use tachometer to know how fast shaft or wheel spin in RPS (revolutions per second). This simple circuit uses two 7-segment displays and one slotted opto sensor MOC7811 where all parts are easy to find. […]
TV Remote Signal Jammer Circuit
555 IC is used in this TV Remote Signal Jammer Circuit. It makes fake IR signals same as remote so TV get confused. TV can not get the real remote signal. We can watch the show without anyone changing the channel. Parts used to complete this circuit are IR LED, ceramic capacitor, NPN transistor, potentiometer, […]
3V to 9V Dual Power Supply Circuit
IC 555 is used in easy circuit. Make both plus and minus voltage from one 3V source like two AA battery. It is useful for 3V to 9V Dual Power Supply Circuit. 555 work as astable multivibrator in circuit. It make square wave again and again on output pin 3. Outside resistors and capacitors control […]
Simple Voltage Follower Circuit using Op-amp IC 741
Simple Voltage Follower Circuit using Op-amp IC 741 give output same like input. It is also called buffer amplifier or unity gain amplifier. IC 741 op-amp is cheap and useful that is why so many people use it. Voltage follower has high input impedance and with low output impedance. It can give current to many […]